C program to sum the series

C program to sum the series 1/1²+1/2²+1/3²

#include <stdio.h> 
 #include <math.h> 
 #include <conio.h> 
 main() 
 { 
   int number; 
   float sum=0.0, num1, num2; 
   clrscr(); 
   printf("\n Enter the value of n: "); 
   scanf(" %d", &number); 
   for(num2=1.0;num2<=number;num2++) 
    { 
       num1=1/pow (num2,2); 
       sum = sum +num1; 
    } 
      printf("\n The sum of series 1/12 + 1/ 22 +....1/n2 = %f", sum); 
      return 0; 
 }